Wi-Fi 分流在行動網路中扮演著極重要的角色以此解決行動資料爆炸的問 題,對於使用行動網路的車間通訊也存在著此問題。因此,這篇論文提出了在車 載網路中透過車對車的車間通訊將行動資料流量分流至車間路徑的一種機制。利 用軟體定義網路 (SDN) 的控制以及集中式管理,來協助行動資料進行分流。每 台車回報自己的相關資訊至 SDN 控制器,如此一來可降低車子本身的計算負 擔,減少複雜度,讓 SDN 控制器進行大量的計算。在傳統的車間路徑計算中, 屬於分散式計算,與傳統的車間路徑相比,集中式的計算能減低車子的的計算負 擔。這篇論文 (1)使用了每台車子的資訊內容,(2) 對於計算和指派命令上在效 能分析上採用集中式管理(3) 試著去找出一條能維持更長時間的車間通訊路徑, 我們提出以 SDN 為基礎的分流機制,在 4G 行動網路和車載網路方面,都能 在普通的車流量中獲得較好的產能。

Wi-Fi offloading plays a vital role for the mobile data explosion problem occurs in the cellular network. For vehicular communication that uses the cellular network, it also results in the mobile data explosion problem. Thus, this work proposed the idea and control scheme for offloading vehicular communication traffic in the cellular network to V2V paths that can exist in Vehicular Ad Hoc Networks (VANETs). The Software Defined Network (SDN) architecture is adopted to tackle the complicated issues of VANET V2V offloading because SDN is a centralized architecture, for which each vehicle reports its context information to SDN Controller, and thus it would reduce the calculation complexity comparing with the traditional V2V path’s finding using the distributed computing paradigm. This work (1) uses each vehicle’s context, (2) adopts centralized management for calculation and notification, (3) tries to establish a VANET routing path that has longer lifetime for a paired-vehicles that are communicating with each other using cellular network. The performance analysis for the proposed SDN- based offloading control scheme show that it has better throughput in both the 4G link and the V2V paths when the vehicle’s density is in the middle.

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